Upon reviewing the data that was gathered, it seemed that the load cell was calibrated incorrectly and as can be seen below, has a zero point of roughly (2.6) kg. It also shows that the maximum thrust produced topped off at just over (5) kg (11 lbf). This would mean that the engine only produced 22% of the thrust it was designed for. This outcome is entirely plausible, however, as the injector redesign was poor but necessary. The video of the test fire clearly demonstrates the engine chugging. This phenomenon is due to poor combustion stability which would be the outcome of a single hole injector design. Unfortunately, a pressure transducer could not be integrated in to the design of the engine. Chamber pressure data could confirm intense pressure fluctuations that may have also contributed to the chugging. I theorize that the pressure in the chamber would rise above the injection pressure for a brief moment causing back pressure on the feed line thus closing the fuel check valve. Thi...